T24.222A Burn of second degree of left knee, initial encounter

ICD-10-CM T24.222A: Burn of second degree of left knee, initial encounter

ICD-10-CM code T24.222A identifies a second-degree burn located on the left knee during an initial encounter. Second-degree burns, also called partial-thickness burns, affect both the outer and underlying layers of skin. The sources establish clinical classifications for these burns and note that burns located on a knee warrant seeking medical care right away if they are deeper or larger. 5 3 4

What this code represents

ICD-10-CM code T24.222A is explicitly labeled as a burn of second degree of left knee for an initial encounter. The same source also lists T24.229A for a second-degree burn of an unspecified knee during an initial encounter. 5

Plain-language overview

Second-degree burns, which are also referred to as partial-thickness burns, affect both the outer layer of the skin and the underlying layer of skin. This distinguishes them from superficial burns, which affect only the outer layer of skin. 3

Clinical context

Clinical literature further divides second-degree burns into superficial partial-thickness and deep partial-thickness categories. A 2024 consensus further classifies deep second-degree burn wounds into shallow deep second-degree and profound deep second-degree burn wounds. 1 2

Second-degree burns are identified as the most common type of burn in clinical practice. Initial data from a 2024 consensus indicates that second-degree burns account for 85.4% of all burn cases, with 56.3% involving less than 10% of the total body surface area. 2

Documentation considerations

If a burn is deeper, larger, or located on the knee, individuals are instructed to seek medical care right away. This clinical guidance for knees is documented alongside other major joints and critical areas such as the hands, feet, face, and groin. 4

What the sources add

While the Centers for Medicare & Medicaid Services provides the official code label for T24.222A, MedlinePlus provides the corresponding clinical definition of a second-degree burn as a partial-thickness injury affecting both the outer and underlying skin layers. 5 3

A clinical review notes that treatment options and technologies for second-degree burn management continue to evolve as the understanding of wound healing advances. This review examines both standard-of-care dressings and pre-clinical hydrogel dressings for these burns. 1

Sources

1. Hydrogels for the management of second-degree burns: currently available options and future promise — pmc.ncbi.nlm.nih.gov; accessed 2026-07-26.
2. Consensus on the treatment of second-degree burn wounds (2024 edition) — pmc.ncbi.nlm.nih.gov; accessed 2026-07-26.
3. Burns: MedlinePlus Medical Encyclopedia — medlineplus.gov; accessed 2026-07-26.
4. Minor burns - aftercare: MedlinePlus Medical Encyclopedia — medlineplus.gov; accessed 2026-07-26.
5. Article - Billing and Coding: Outpatient Physical and Occupational Therapy Services (A57067) — cms.gov; accessed 2026-07-26.